Warm roofs in Rhyl📍
Mar 25, 2022 – Apr 25, 2022
⭐Warm roofs⭐
Adding thermal insulation
Many flat roofs have been constructed with little or no thermal insulation. Not only does this mean a higher heating bill to keep the room(s) warm but also there may be an accumulation of moisture within the roof structure that can lead to rotting of the structural timbers, and even poorer thermal insulation if the insulation becomes wet.
The solution is to retain as much of the existing structure as possible (assuming no rot) and add extra insulation, a vapour barrier and a new top weather-proof surface.
Wherever warm moist air meets a cold surface condensation can be a problem. If this occurs within the roof space it will cause damage and neutralise the effectiveness of any thermal insulation. See the section on Interstitial condensation.
First, the existing waterproof roof surfacing must be removed. This is usually 3-ply felt. Then a vapour barrier of 125 micron polythene is laid to prevent moisture from inside the room entering the thermal insulation.
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